Adding track 4
Adding track 5
problem 4
Adding track 1 answer
Adding track 2 answer
Adding track 3 answers
Updating fizzbuzz answer
Refining track 3 answer
alternate prime? solution
refactored prime? method
tail recursive Fibonacci.calculate
tail recursive Fibonacci.calculate
refactored tail recursive Fibonacci.calculate
flood fill method
Merge branch 'answers' of github.com:snebel/rubymindbenders into answers